Milling-cutter.



L. A. CORNELIUS.

MILLING CUTTER. APPLICATION TILED NOV. 5, 1010.

Patented Apr. 25, 1911.

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UNITE LOUIS A. CORNELIUS, 0F GRAND RAPIDS, MICHIGAN.

MILLING-CUTTER.

Specification of Letters Patent.

Patented Apr. 25, 1911.

Application filed November 5, 1910. Serial No. 590,863.

To all whom "it may concern:

Be it known that I, LOUIS A. CORNELIUS, a citizen of the United Statesof America, residing at Grand Rapids, in the county of Kent and State ofMichigan, have invented certain new and useful Improvements inMilling-Cutters; and I do hereby declare the following to be a full,clear, and exact de scription of the invention, such as will enableothers skilled in the art to which it appertains to make and use thesame.

My invention relates to improvements in end milling cutters and moreparticularly to such mills as are used on valve seating tools, and itsobject is to provide the same with means for preventing the tool fromchattering and thus making rough work. Heretofore such mills have beenmade with radiating cutting teeth and when rotated in contact with thework, the teeth would cause a vibration of the tool resulting in what istechnically known as chattering and consequently a rough and unevensurface would be left on the work, thus defeating the purpose of theoperation. To remedy this dithculty, I have found that by making aportion of the teeth non-continuous this difliculty is entirely overcomeand the tool will Work Without such vibration and leave the surface ofthe Work smooth, even, and in satisfactory condition.

Referring to the drawings which represent an embodiment of one form ofmy invention: Figure 1 is a perspective of an end millin tool adaptedfor dressing the seats of val ves, such as globe valves and the like;Fig. 2 a plan View of the cutting end of the same; and Fig. 3 a sectionthrough the axis of the same on the line 33 of Fig. 2.

Like numbers refer to like parts in all of the figures.

1 represents the cylindrical body of the cutter having an axial opening,screw threaded to receive the end of any suitable arbor or spindle foroperating the cutter.

2 represents the usual radially disposed teeth on the end of the bodyadapted to operate upon the work in the manner of the usual end mill,and 3 represent portions of the teeth cut away, whereby the same arerendered non-continuous. These cut away portions are preferably in theform of channels or grooves 3 extending chordally across the face of thecutter and through the projecting teeth on the same, whereby a portionof the teethare rendered non-continuous. This has the effect to remedyany tendency on the part of the cutter to chatter or vibrate when inoperation and renders the work smooth when operated upon by the cutter.

WVhile I have shown the mill provided with a central screw threadedopening to provide for attachment to the driving arbor, it is obviousthat such a mill may be provided with any of the common forms ofattachment to a driving arbor, such as an integral shank, a plainopening, or an opening provided with a key, etc., without departing fromthe spirit or purpose of my invention.

WVhat I claim is 1. An end mill having a cylindrical body with a centralopening to receive a'driving spindle, radially disposed cutting teeth onthe end of the said body, and recesses or cut away portions in the teethwhereby the same are rendered non-continuous.

2. An end mill, substantially as described, comprising a cylindricalbody having radially disposed cutting teeth on the end and chordallydisposed channels extending across the said end whereby a portion of theteeth are made non-continuous, for the purpose specified.

In testimony whereof I afiix my signature in presence of two witnesses.

LOUIS A. CORNELIUS.

WVitnesses:

WVALTER H. BROOKS, PALMER A. JONES.

Copies of this patent may be obtained for five cents each, by addressingthe Commissioner of Patents, Washington, D. G.

